index.js

/*!
 * calculation.js v1.0.0
 * 2018 rumengkai@aliyun.com
 * Released under the MIT License.
 */
(function (global, factory) {
	typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
			typeof define === 'function' && define.amd ? define(factory) : (global.accuracy = factory());
})(this, function () {
	let obj =  {
			division(arg1, arg2) { //除法
					var t1 = 0, t2 = 0, r1, r2;
					try {
							t1 = arg1.toString().split(".")[1].length
					} catch (e) {
					}
					try {
							t2 = arg2.toString().split(".")[1].length
					} catch (e) {
					}
					if (Math) {
							r1 = Number(arg1.toString().replace(".", ""));
							r2 = Number(arg2.toString().replace(".", ""));
							return this.multiplication((r1 / r2), Math.pow(10, t2 - t1));
					}
			},
			multiplication(arg1, arg2) {//乘法
					var m = 0, s1 = arg1.toString(), s2 = arg2.toString();
					try {
							m += s1.split(".")[1].length
					} catch (e) {
					}
					try {
							m += s2.split(".")[1].length
					} catch (e) {
					}
					return Number(s1.replace(".", "")) * Number(s2.replace(".", "")) / Math.pow(10, m)
			},
			addition(arg1, arg2) {//加法
					var r1, r2, m;
					try {
							r1 = arg1.toString().split(".")[1].length
					} catch (e) {
							r1 = 0;
					}
					try {
							r2 = arg2.toString().split(".")[1].length
					} catch (e) {
							r2 = 0;
					}
					m = Math.pow(10, Math.max(r1, r2));
					return (arg1 * m + arg2 * m) / m
			},
			subtraction(arg1, arg2) {//减法
					var r1, r2, m, n;
					try {
							r1 = arg1.toString().split(".")[1].length
					} catch (e) {
							r1 = 0;
					}
					try {
							r2 = arg2.toString().split(".")[1].length
					} catch (e) {
							r2 = 0;
					}
					m = Math.pow(10, Math.max(r1, r2));
					n = (r1 >= r2) ? r1 : r2;
					return ((arg1 * m - arg2 * m) / m).toFixed(n);
			},
			div(arg1, arg2) { //除法
					return this.division(arg1, arg2)
			},
			mul(arg1, arg2) {//乘法
					return this.multiplication(arg1, arg2)
			},
			add(arg1, arg2) {//加法
					return this.addition(arg1, arg2)
			},
			sub(arg1, arg2) {//减法
					return this.subtraction(arg1, arg2)
			},
			toCeil(num, p = 4) {
					num = isNaN(num)?0:num
					p = isNaN(p)?0:p
					let precision = Math.pow(10, p)
					return Math.ceil((num * precision).toFixed(1)) / precision
			},
			toFloor(num, p = 4) {
					num = isNaN(num)?0:num
					p = isNaN(p)?0:p
					let precision = Math.pow(10, p)
					return Math.floor((num * precision).toFixed(1)) / precision
			}
	}
	return obj
})

// # 升级补丁版本号
// $ npm version patch

// # 升级小版本号
// $ npm version minor

// # 升级大版本号
// $ npm version major